Refer to point 1.05 on the Sir-Tech Wiz8 Common Issues page. If that don't work, try these instructions for a manual install:Warning: You will need about 3.5Gb of free disk space!
1) Make a folder under C:\WINDOWS\TEMP, and call it "WIZ8TEMP".
2a) Copy every files from CDs 1, 2 and 3 to this temporary folder. Note: Windows will probably give a prompt about copying files to a folder that already exists for CDs 2 and 3, just click on the "Yes to All" button.
2b) Check each file size in the temporary folder is EXACTLY the same as on the CD (this as been the cause of many problems, the installer would sometimes stop copying ~1-4Kb short, possibly caused by ppl pressing the CD-ROM eject button before the ROM drive had completely "spun-down").
3) Once done all three CDs, select all the files in the temporary folder, then right-click and select Properties. Ensure the "Read-Only" attribute is not selected (ie, no tick, it will probably show as a greyed out tick, left-click until it shows no tick), and ensure to apply to all sub-directories / files etc.
4) Run the "AUTORUN.EXE" file, and perform an install as per normal.
5) Once completed, you can delete the C:\WINDOWS\TEMP\WIZ8TEMP folder.
6) Apply the 12_23 patch (if needed), remembering to ensure the "Use Folder Names" option is selected (ie, is ticked).
...and that should do it!!!
I should have more time tomorrow to check in on how you went.
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Visit http://www.foerster.cc/wolfie or http://wiz8.web1000.com/ (US) for a spreadsheet that allows you to enter in your spellcaster's stats, and it will tell you what spells the character can learn, or for spells that they are not yet able to learn, it will tell you how many points they need, or why your character can't learn the spell.